Measuring

Measure a wing from plans

Scan the top view on the plans, then mark a length you know to set the scale.

Written for iPhone. The steps are the same on iPad.

What you need

  • The plans, flat and in good light
  • A length printed on the plans, the longer the better

Steps

  1. Open the aircraft and tap Measure wing with camera.
  2. At the top, set From to Plans.
  3. Tap Scan plans and photograph the top view of the wing. Or tap Choose image of plans.
  4. Drag both handles onto the ends of a length printed on the plans.
  5. Enter that length under Real length, then tap Continue.
  6. Mark the root or the centerline, and adjust the corners as you would for a photo.
  7. Tap Show results, check the sizes against the plans, and tap Save.

Good to know

  • Use the longest printed length you can find, such as the wingspan. Short lengths make small errors bigger.
  • The same steps measure the stab. Set Measure to Horizontal stab at the top.

If it doesn't work

The scan looks skewed
Lay the plans flat and scan again. Let the scanner find the edges of the page.

Words used here

CG
Center of gravity: the point where the model balances. Too far back makes it unstable. Too far forward makes the nose hard to lift.
Root
The inner end of a wing or stab, where it meets the fuselage.
Span
The width of the wing from tip to tip. Half-span is one side, from the centerline to the tip.

Still stuck?

Email goes straight to the developer. Say which guide you were following, and whether you're on iPhone or iPad.